1. 50MB For 100Naira – You can purchase this Airtel data plan and get 50MB For 100Naira and it is valid for just 24hours.
Activation Code: *410# . Validity: 24 hours which is 1 day.

2. 200MB for 200Naira – You can purchase this Airtel data plan and get 150MB For 200Naira and it is valid for just 3 days .
Activation Code: *412# . Validity:3 days.

3. 350MB for 300Naira – You can purchase this Airtel data plan and get 350MB For 300Naira and it is valid for just 7 days.
Activation Code: *417# . Validity: 7 days.

4. 750MB for 500Naira – You can purchase this Airtel data plan and get 750MB For 500Naira and it is valid for just 14 days.
Activation Code: *418# . Validity: 14 days.

5. 1.5GB For 1,000Naira – You can purchase this Airtel data plan and get 1.5GB For 1000Naira and it is valid for just 30 days.
Activation Code: *496# . Validity: 30 days.

6. 3.5GB For 2,000Naira – You can purchase this Airtel data plan and get 3.5GB For 2000Naira and it is valid for just 30 days.
Activation Code: *437# . Validity: 30 days.

7. 5GB For 2500Naira -You can purchase this Airtel data plan and get 5GB For 2500Naira and it is valid for just 30 days.
Activation Code: *437*1# . Validity: 30 days.

See the rest here: http://www.rammyblog.com.ng/2017/09/airtel-complete-list-of-data-plan.html